From 5afa947d89f6e843bb2708391d3727e5a1b8c0e5 Mon Sep 17 00:00:00 2001
From: Nick Krichevsky <nick@ollien.com>
Date: Sat, 1 Sep 2018 19:35:56 -0400
Subject: [PATCH] Add headercmp

---
 common/http_types.c | 21 +++++++++++++++++++++
 common/http_types.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/common/http_types.c b/common/http_types.c
index 346173a..0da4ae1 100644
--- a/common/http_types.c
+++ b/common/http_types.c
@@ -1,4 +1,5 @@
 #include "http_types.h"
+#include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -50,3 +51,23 @@ void free_headers(struct http_header *headers) {
     // next_header should have already been freed by recursion
     free(headers);
 }
+
+/**
+ * Compare the name of a header to a given name, case insensitively
+ *
+ * @param name The name to compare against.
+ *
+ * @return The result of strcmp(lower_case_header_name, name)
+ */
+int headercmp(const char *name) {
+    int name_length = strlen(name) + 1;
+    char *lower_name = malloc(name_length * sizeof(char));
+    char *lower_cursor = lower_name;
+    for (const char *cursor = name; *cursor != '\0'; (cursor++, lower_cursor++)) {
+        *lower_cursor = tolower(*cursor);
+    }
+    int cmp_result = strcmp(lower_name, name);
+    free(lower_name);
+
+    return cmp_result;
+}
diff --git a/common/http_types.h b/common/http_types.h
index 867a7b2..78344b8 100644
--- a/common/http_types.h
+++ b/common/http_types.h
@@ -18,5 +18,6 @@ struct http_header {
 
 struct http_header *insert_header(const char *header_name, const char *header_value, struct http_header *existing_header);
 void free_headers(struct http_header *headers);
+int headercmp(const char *name);
 
 #endif